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Operations on Matrices and Data Frames - English

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Outline:

How to find the inverse of a matrix How to calculate the sum of elements in a matrix using for loop How to calculate the sum of elements in a matrix using the sum function How to calculate the time elapsed in an operation How to find out the sum of rows of a matrix How to find out the sum of columns of a matrix How to add a new column or row to an existing data-frame How to use cbind and rbind function